#include <iostream>
#include <string>
#include <cstdlib>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include "UdpServer.hpp"

void Usage(string proc)
{
    cout << "Usage:\n\t" << proc << "local_ip_port\n"
         << endl;
}
int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        Usage(argv[0]);
        exit(1);
    }
    string serverip = argv[1];
    uint16_t serverport = stoi(argv[2]);

    // 1、创建套接字
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        cerr << "socket create error" << endl;
    }

    // 构建目标主机socket信息
    struct sockaddr_in server;
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport);                 
    server.sin_addr.s_addr = inet_addr(serverip.c_str()); 

    string message;
    // 2、直接通信
    while (true)
    {
        cout << "Please enter# ";
        getline(cin, message);
        sendto(sockfd, message.c_str(),  message.size(), 0, (struct sockaddr*)&server, sizeof(server));

        struct sockaddr_in peer;
        socklen_t len = sizeof(peer);
        char buffer[1024];
        ssize_t n =recvfrom(sockfd, buffer, sizeof(buffer)-1, 0, (struct sockaddr*)&peer, &len);
        if(n > 0)
        {
            buffer[n] = 0;
            cout << "server echo# " << buffer <<endl;
        }
    }
    return 0;
}